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I started using these on my last tank set-up as I was looking for a cheaper alternative to biomax ceramic rings. They seem to provide the same amount of surface area for BB based on manufactures statements. They are however a lot harder to clean.

I bought a 6G bag of these for 10$ at my lfs and used some of them in a trickle tower for my 100 for a long time. I still have them but they are not currently in use. No complaints though.

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Gas mileage isn't everythingOIIIIIIIOLack of planning on your part does not constitute an emergency on my part.Why pretend there are no stupid questions? Actually, There are many stupid questions: "Should I drink this bleach?" Is just one example.
Having said that, Just because it's a stupid question doesn't mean that it shouldn't be asked. It's better to know.A warm beer is better than a cold beer. Because nothing is better than a cold beer, and a warm beer is better than nothing.